The Schneider 78ACSX-4 is a four-pole, step-down, high-efficiency autotransformer designed to reduce an incoming voltage to a desired voltage level. The 78ACSX-4 is equipped with a safety-grounded enclosure and has an input voltage range of 208-277V. It has an adjustable output voltage of 110-277V, a power rating of 500VA, and a frequency of 50/60 Hz. The 78ACSX-4 is UL, CSA, and CE approved, and is designed for many commercial, industrial, and residential applications.